That circuit protects the overdriven signals going into an amplifier. Instead of a zener diode we use a transistor. That way we ensure that the above the ordinary input voltages ( 1 volt r.m.s.) can be acheaved without distortion. Also the use of a transistor limits the number of components used in this schematic.
Datasheet file1: Click here to download 1N4148.pdf datasheet. Datasheet file2: Click here to download BC617.pdf datasheet.
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